/Engine/Source/Developer/TargetPlatform/Public/Interfaces/IShaderFormat.h
Called before a shader is compiled to allow the platform shader format to modify the shader compiler input, e.g. by adding console variable values relevant to shader compilation on that platform.
virtual void ModifyShaderCompilerInput ( [FShaderCompilerInput](API\Runtime\RenderCore\FShaderCompilerInput) & Input ) const